Re: dB SPL to dBA (Pierre Divenyi )

Subject: Re: dB SPL to dBA
From:    Pierre Divenyi  <pdivenyi(at)marva4.ncsc.med.va.gov>
Date:    Wed, 20 May 1998 10:27:17 -0700

At 04:56 PM 5/20/98 +0200, Patrick Susini wrote:
>An approximation can be obtained for dBA as follow
>
>function [y] =3D pondBA(n,fs)
>
>%FUNCTION [y] =3D pondBA(n,fs)
>%
>%Calcul la ponderation dB(A) en dB
>%n : nombre de points (c-a-d la resolution frequentielle)
>%fs : frequence d'echantillonnage
>%
>
>i=3D[1:1:n];
>x=3D(fs/2)/n*i;
>x=3Dlog10(x);
>y =3D -184.786441+160.661125*x.=D81-55.73236*x.=D82+10.073034*x.=D83-0.8=
34527*
>x.=D84;%en dB
>
>
>--
For the benefit of those on the list whose French is rusty, here is a
translation of the header:

%FUNCTION [y] =3D pondBA(n,fs)
%
%Computation of dB(A) weights in dB
%n : number of points (i.e., frequency resolution points)
%fs : sampling frequency

By the way, Patrick, what is the source of your algorithm (i.e., who came
up with it)?

        Pierre

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Pierre Divenyi             Experimental Audiology Research (151)
                           V.A. Medical Center, Martinez, CA 94553, USA
Phone: (510) 370-6745;     Fax: (510) 228-5738
E-mail :                   PDivenyi(at)ucdavis.edu
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